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Note 5 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 23, 2019 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Preferred Stock, Shares Outstanding, Ending Balance |  | 0 | 0 | 0 |
Common Stock, Dividends, Per Share, Declared |  | $ 0.24 | $ 0.96 | $ 0.92 | $ 0.88
Treasury Stock, Shares, Acquired |  |  | 1,300,000 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 150,338 | $ 179,813 | $ 249,760
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 371,000 | $ 371,000 |  |
Exercise or Vesting [Member] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 1,600,000 | 1,600,000 |  |
Future Issuance [Member] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 6,300,000 | 6,300,000 |  |
Subsequent Event [Member] |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.26 |  |  |  |
Dividends Payable, Date to be Paid | Feb. 22, 2019 |  |  |  |
Dividends Payable, Date of Record | Feb. 08, 2019 |  |  |  |

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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